The Kiwi heavyweight has been stopped in the 11th round by English fighter Fabio Wardley.
Joseph Parker took a gamble and paid the price, slipping against a British knockout machine.
Parker was finished by TKO in round eleven at the hands of Fabio Wardley at the O2 Arena.
It was an absolute war between the two warriors, each finding success and near finishes across eleven brutal rounds.
With a win all but guaranteeing him a shot at the undisputed champion, Parker's dreams of undisputed gold appear to be over.
Author's summary: Joseph Parker suffers defeat against Fabio Wardley.